Use of a prohibition order after a large outbreak of gastroenteritis caused by norovirus among function attendees.

Introduction: In May 2011, an outbreak of acute gastroenteritis occurred among guests attending two functions (Function A and B) at a local function centre in Sydney, Australia. The Sydney South West Public Health Unit and the New South Wales (NSW) Food Authority sought to determine the cause of the outbreak and implement control measures.

Methods: A retrospective cohort study was planned.